package com.controller;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import com.util.ConstantUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;

@Controller
public class CaptchaController {
 
    @Autowired
    private Producer captchaProducer;
 
    @RequestMapping("/kaptcha")
    public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
        HttpSession session = request.getSession();
        String code = (String)session.getAttribute(ConstantUtil.KAPTCHA_SESSION_KEY);

        response.setDateHeader("Expires", 0);  
          
        // Set standard HTTP/1.1 no-cache headers.  
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
          
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).  
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");  
          
        // Set standard HTTP/1.0 no-cache header.  
        response.setHeader("Pragma", "no-cache");  
          
        // return a jpeg  
        response.setContentType("image/jpeg");  
          
        // create the text for the image  
        String capText = captchaProducer.createText();  
          
        // store the text in the session  
        session.setAttribute(ConstantUtil.KAPTCHA_SESSION_KEY, capText);
        System.out.println("******************验证码是: " + capText + "******************");

        // create the image with the text  
        BufferedImage bi = captchaProducer.createImage(capText);
        ServletOutputStream out = response.getOutputStream();
          
        // write the data out  
        ImageIO.write(bi, "jpg", out);
        try {  
            out.flush();  
        } finally {  
            out.close();  
        }  
        return null;  
    }  
  
}